Watch Sadisflix. "Twas the Night Before Spongemas" is a SpongeBob SquarePants episode, produced as a stand-alone special for season 13. In this episode, on Christmas Eve, SpongeBob and his friends look back on some of the fun and less-than-jolly Christmas moments. And when Christmas morning comes around, they realize that what matters most is the loving warmth of the holiday cheer.